I do believe Tank mounted ones do exist but they don't come cheap either.
They're basically modded versions of the ceiling mounted ones, they hang on a brace that rests on your tanks, thus no need to drill into the ceiling, however, how strong it is or how taxing on your tank's bracing, i have no idea.
The pros would be that your ceiling would be spotless.
The cons however are more. Due to the lack of distance between the water and the MH, temperatures may increase slightly as well as visually the brace is not as appeasing as the pendant.
Ask Brrrr (Vincent) more about this, he was the one who informed me of such a brace, perhap you could PM him then.
Cheers,
Jerome
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